<template>
  <div>
    <el-switch
      v-model="draggable"
      active-text="开启拖拽"
      inactive-text="关闭拖拽"
    >
    </el-switch>
    <el-button v-show="draggable" @click="batchSave"> 批量保存 </el-button>
    <el-button type="danger" @click="batchDelete">批量删除</el-button>
    <el-tree
      :data="menus"
      :props="defaultProps"
      :expand-on-click-node="false"
      show-checkbox
      node-key="catId"
      :default-expanded-keys="expandedKey"
      :draggable="draggable"
      :allow-drop="allowDrop"
      @node-drop="handleDrop"
      ref="menuTree"
    >
      <span class="custom-tree-node" slot-scope="{ node, data }">
        <span>{{ node.label }}</span>
        <span>
          <el-button
            v-if="node.level <= 2"
            type="text"
            size="mini"
            @click="() => append(data)"
          >
            Append
          </el-button>
          <el-button type="text" size="mini" @click="() => edit(data)">
            Update
          </el-button>
          <el-button
            v-if="node.childNodes.length == 0"
            type="text"
            size="mini"
            @click="() => remove(node, data)"
          >
            Delete
          </el-button>
        </span>
      </span>
    </el-tree>
    <el-dialog :title="title" :visible.sync="dialogVisible" width="30%">
      <el-form :model="category">
        <el-form-item label="分类名称">
          <el-input v-model="category.name" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="图标">
          <el-input v-model="category.icon" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="计量单位">
          <el-input
            v-model="category.productUnit"
            autocomplete="off"
          ></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="dialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="submitData">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      draggable: false,
      updateNodes: [],
      maxLevel: 0,
      title: "",
      dialogType: "", //对话框类型
      category: {
        name: "",
        parentCid: 0,
        catLevel: 1,
        showStatus: 1,
        sort: 0,
        catId: null,
        icon: "",
        productUnit: "",
      },
      dialogVisible: false,
      menus: [],
      expandedKey: [],
      defaultProps: {
        children: "children",
        label: "name",
      },
    };
  },
  methods: {
    getMenus() {
      this.$http({
        url: this.$http.adornUrl("/product/category/list/tree"),
        method: "get",
      }).then(({ data }) => {
        // console.log("成功获取到菜单数据...", data);
        this.menus = data.data;
      });
    },
    batchDelete() {
      let checkedNodes = this.$refs.menuTree.getCheckedNodes();
      let catIds = [];
      let menuNames = [];
      for (let i = 0; i < checkedNodes.length; i++) {
        catIds.push(checkedNodes[i].catId);
        menuNames.push(checkedNodes[i].name);
      }
      this.$confirm(`是否批量删除[${menuNames}]菜单?`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      })
        .then(() => {
          this.$http({
            url: this.$http.adornUrl("/product/category/delete"),
            method: "post",
            data: this.$http.adornData(catIds, false),
          }).then(({ data }) => {
            this.$message({
              message: `菜单批量删除成功!`,
              type: "success",
            });
            this.getMenus();
          });
        })
        .catch(() => {});
    },
    batchSave() {
      this.$http({
        url: this.$http.adornUrl("/product/category/update/sort"),
        method: "post",
        data: this.$http.adornData(this.updateNodes, false),
      }).then(({ data }) => {
        this.$message({
          message: `菜单顺序等修改成功!`,
          type: "success",
        });
        //刷新出新的菜单
        this.getMenus();
        //设置需要默认展出的菜单
        this.updateNodes = [];
        this.maxLevel = 0;
      });
    },
    handleDrop(draggingNode, dropNode, dropType, ev) {
      //1.获取最新父节点的id
      let parentCid = 0;
      let siblings = null;
      if (dropType == "inner") {
        parentCid = dropNode.data.catId;
        siblings = dropNode.childNodes;
      } else {
        parentCid = dropNode.data.parentCid;
        siblings = dropNode.parent.childNodes;
      }
      //2.当前拖拽节点的最新顺序
      for (let i = 0; i < siblings.length; i++) {
        if (siblings[i].data.catId == draggingNode.data.catId) {
          //如果遍历的是当前正在拖拽的节点
          let catLevel = draggingNode.level;
          if (siblings[i].level != catLevel) {
            //当前节点的层级发生变化
            catLevel = siblings[i].level;
            //修改子节点的层级
            this.updateChildNodeLevel(siblings[i]);
          }
          this.updateNodes.push({
            catId: siblings[i].data.catId,
            sort: i,
            parentCid,
            catLevel,
          });
        } else {
          this.updateNodes.push({ catId: siblings[i].data.catId, sort: i });
        }
      }
      //3.当前拖拽节点的最新层级
      console.log("updateNodes", this.updateNodes);
      this.expandedKey = [parentCid];
    },
    updateChildNodeLevel(node) {
      if (node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          var cNode = node.childNodes[i].data;
          this.updateNodes.push({
            catId: cNode.catId,
            catLevel: node.childNodes[i].level,
          });
          this.updateChildNodeLevel(node.childNodes[i]);
        }
      }
    },
    allowDrop(draggingNode, dropNode, type) {
      //1.被拖动的当前节点以及所在的父节点总层数不能大于3

      //1）、被拖动的当前节点总层数
      this.countNodeLevel(draggingNode);
      //当前正在拖动的节点+父节点的深度小于3即可
      var deep = this.maxLevel - draggingNode.level + 1;
      console.log("deep", deep);
      if (type == "inner") {
        return deep + dropNode.level <= 3;
      } else {
        return deep + dropNode.parent.level <= 3;
      }
    },
    countNodeLevel(node) {
      //找到所有子节点，求出最大深度
      if (node.childNodes != null && node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          if (node.childNodes[i].level > this.maxLevel) {
            this.maxLevel = node.childNodes[i].level;
          }
          this.countNodeLevel(node.childNodes[i]);
        }
      } else {
        this.maxLevel = node.level;
      }
    },
    submitData() {
      if (this.dialogType == "add") {
        this.addCategory();
      }
      if (this.dialogType == "edit") {
        this.editCategory();
      }
    },

    append(data) {
      console.log("append", data);
      this.category = { ...this.$options.data().category };
      this.dialogType = "add";
      this.title = "添加分类";
      this.dialogVisible = true;
      this.category.parentCid = data.catId;
      this.category.catLevel = data.catLevel * 1 + 1;
    },
    editCategory() {
      let { catId, name, icon, productUnit } = this.category;
      this.$http({
        url: this.$http.adornUrl("/product/category/update"),
        method: "post",
        data: this.$http.adornData({ catId, name, icon, productUnit }, false),
      }).then(({ data }) => {
        this.$message({
          message: `菜单修改成功!`,
          type: "success",
        });
        this.dialogVisible = false;
        //刷新出新的菜单
        this.getMenus();
        //设置需要默认展出的菜单
        this.expandedKey = [this.category.parentCid];
      });
    },
    addCategory() {
      console.log("添加三级菜单的数据", this.category);
      this.$http({
        url: this.$http.adornUrl("/product/category/save"),
        method: "post",
        data: this.$http.adornData(this.category, false),
      }).then(({ data }) => {
        this.$message({
          message: `菜单保存成功!`,
          type: "success",
        });
        this.dialogVisible = false;
        //刷新出新的菜单
        this.getMenus();
        //设置需要默认展出的菜单
        this.expandedKey = [this.category.parentCid];
      });
    },
    edit(menu) {
      console.log("要修改的数据：", menu);
      this.dialogType = "edit";
      this.title = "修改分类";
      this.dialogVisible = true;
      //发送请求获取当前节点的最新信息
      this.$http({
        url: this.$http.adornUrl(`/product/category/info/${menu.catId}`),
        method: "get",
      }).then(({ data }) => {
        console.log("要回显的数据", data);
        Object.assign(this.category, data.data);
      });
    },
    remove(node, menu) {
      var ids = [menu.catId];
      this.$confirm(`是否删除【${menu.name}】菜单?`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      }).then(() => {
        this.$http({
          url: this.$http.adornUrl("/product/category/delete"),
          method: "post",
          data: this.$http.adornData(ids, false),
        })
          .then(({ data }) => {
            if (data.code == 0) {
              this.$message({
                message: `菜单删除成功!`,
                type: "success",
              });
            } else {
              this.$message.error(`菜单删除失败!`);
            }
            //刷新出新的菜单
            this.getMenus();
            //设置需要默认展出的菜单
            this.expandedKey = [menu.parentCid];
          })
          .catch(() => {});
      });
    },
  },
  created() {
    this.getMenus();
  },
};
</script>

<style>
</style>